migrate from maven to gradle

 - add gradle build scripts and settings
 - move resources
 - fix sh and bat jar file name
 - remove maven pom.xml
 - migrate plugin maven-izpack to gradle-izpack
 - adjust locations and variables
 - add and configure macApp plugin
remove non-working mac build parts
add default gradle task
remove tool dir
removed [Map]: from internal window titles #189
extend iconified map width to double of minimal width #189
make search result dialog modeless #173
unhide swallowed exceptions
fix problem #181 with opening dialog when succesfully launching ref node